问如何使用dojo/dnd/Moveable以编程方式开始拖动项？

EN

require(["dojo/dnd/Moveable", "dojo/dom", "dojo/on", "dojo/domReady!"],
        function (Moveable, dom, on) {

            on(dom.byId('btn'), 'click', function () {
                var dnd = new Moveable(dom.byId("dndOne"));
                on(dnd, "FirstMove", function (event, leftTop) {
                    console.log('FirstMove', leftTop);
                });
                on(dnd, "Move", function (event, leftTop) {
                    console.log('Move', leftTop);
                });
            });
        });